21095396 has 36 divisors (see below), whose sum is σ = 44549568. Its totient is φ = 8560944.

The previous prime is 21095381. The next prime is 21095401. The reversal of 21095396 is 69359012.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9065 + ... + 11151.

It is an arithmetic number, because the mean of its divisors is an integer number (1237488).

Almost surely, 2^21095396 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21095396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22274784).

21095396 is an abundant number, since it is smaller than the sum of its proper divisors (23454172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21095396 is a wasteful number, since it uses less digits than its factorization.

21095396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136 (or 2115 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 21095396 is about 4592.9724580058. The cubic root of 21095396 is about 276.3095490743.

The spelling of 21095396 in words is "twenty-one million, ninety-five thousand, three hundred ninety-six".